<!doctype html>
<html>

<head></head>

<body>
    <div id="box" style="width:252px;font:25px/25px 宋体;background:#000;color:#9f9;border:#999 20px ridge;text-shadow:2px 3px 1px #0f0;"></div>
    <script>
        var domain = "www.zuidaima.com";
        var author = "zuidaima";
        var map = eval("[" + Array(23).join("0x801,") + "0xfff]");
        var tatris = [
            [0x6600],
            [0x2222, 0xf00],
            [0xc600, 0x2640],
            [0x6c00, 0x4620],
            [0x4460, 0x2e0, 0x6220, 0x740],
            [0x2260, 0xe20, 0x6440, 0x4700],
            [0x2620, 0x720, 0x2320, 0x2700]
        ];
        var keycom = {
            "38": "rotate(1)",
            "40": "down()",
            "37": "move(2,1)",
            "39": "move(0.5,-1)"
        };
        var dia, pos, bak, run;

        function start() {
            dia = tatris[~~(Math.random() * 7)];
            bak = pos = {
                fk: [],
                y: 0,
                x: 4,
                s: ~~(Math.random() * 4)
            };
            rotate(0);
        }

        function over() {
            document.onkeydown = null;
            clearInterval(run);
            alert("GAME OVER");
        }

        function update(t) {
            bak = {
                fk: pos.fk.slice(0),
                y: pos.y,
                x: pos.x,
                s: pos.s
            };
            if (t) return;
            for (var i = 0, a2 = ""; i < 22; i++)
                a2 += map[i].toString(2).slice(1, -1) + "<br/>";
            for (var i = 0, n; i < 4; i++)
                if (/([^0]+)/.test(bak.fk[i].toString(2).replace(/1/g, "\u25a1")))
                    a2 = a2.substr(0, n = (bak.y + i + 1) * 15 - RegExp.$_.length - 4) + RegExp.$1 + a2.slice(n + RegExp.$1.length);
            document.getElementById("box").innerHTML = a2.replace(/1/g, "\u25a0").replace(/0/g, "\u3000");
        }

        function is() {
            for (var i = 0; i < 4; i++)
                if ((pos.fk[i] & map[pos.y + i]) != 0) return pos = bak;
        }

        function rotate(r) {
            var f = dia[pos.s = (pos.s + r) % dia.length];
            for (var i = 0; i < 4; i++)
                pos.fk[i] = (f >> (12 - i * 4) & 15) << pos.x;
            update(is());
        }

        function down() {
            ++pos.y;
            if (is()) {
                for (var i = 0; i < 4 && pos.y + i < 22; i++)
                    if ((map[pos.y + i] |= pos.fk[i]) == 0xfff)
                        map.splice(pos.y + i, 1), map.unshift(0x801);
                if (map[1] != 0x801) return over();
                start();
            }
            update();
        }

        function move(t, k) {
            pos.x += k;
            for (var i = 0; i < 4; i++)
                pos.fk[i] *= t;
            update(is());
        }
        document.onkeydown = function(e) {
            eval(keycom[(e ? e : event).keyCode]);
        };
        start();
        run = setInterval("down()", 400);
    </script>
</body>

</html>